Minecraft v1.16.5
Forge v36.1.16
Omni v1.2.2
Pokecube AIO v3.12.0a

I have discovered that stones and cave biomes from Omni are generating in the Distorted World and Ultraspace Dimensions from the Pokecube AIO mod, which breaks the ambience of those dimensions. Pokecube uses the datapack system to create it's dimensions. Maybe a dimension/biome blacklist/whitelist for stones and cave biomes could be added?

This biome normally only has the blue Ultrastone in this dimension: